Select the column with the surnames. Click on 'Data'. Click on 'Sort'. You should get a dialogue box saying that Excel has found more data in adjacent columns and what do you want to do about it it? Choose 'Expand the selection'. Other columns will then be included, and a new dialogue box appears Clicking on the drop-down arrow will produce another box with your option of choosing a column. Select the column you want to sort by, (the one with the surnames in your case), and click OK.